efficiency of regenerative braking?

======================================== They give the E and P per kg data for their 48V module, but they have a

Batteries require at least 160 % to recharge . If you get 100 % , it will take at least 1.6 times that energy to charge the batt' .

Electric Braking wears few parts , so its a good idea . But you must apply current to a rotor to make magnetic flux , to produce amperage in the stator . But it does work well , as our cars have alternators that are efficient , taking only 20 watts rotor for 700 watts at the stator .

They have a wide speed range . Car alternators will work well between 1000 and 10,000 RPM . I dont like 10,000 RPM for the wear/tear on ball bearings/needle bearings . I prefer less than 6000 .

First pick a good motor , then design braking .

BTW Wind generators can use car alt' well , keep the output in 3 phase and above 40 volts til it reaches the batteries , then switch mode "buck" regulate to charge battteries .

And SCR's can be used to modify the output to run 60hz appliances . 3 phase to single phase , by switching the 3 windings at the proper time . U need 6 SCR's for a Delta wound .

BTW , OT .. fully discharge a NimH battery ? Nikon ( S-4 digi-cam) says you must fully discharge their batteries occasionaly .. What do you think ? Lead Acid batteries , sulfate , but NimH are opposite electrolyte , its alkaline . Is there a similar effect to sulfation in hydroxide in a dry AA NimH cell ?

RichD wrote:

------------------ it i s not only for trains it is as well or mostly for cars !! (they are the great energy wasters and poluters !!

Y.P

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Just by saying "motors and controllers" means you're tallking about a network, It's just a local separable network.

There are controllers that can convert the DC from

That's only because DC is not a voltage, it's a capacitance.

It's unlikely it can it convert to 100 GHz, since that's the frequency band weather balloons use,

Do you always talk s*it ?

Graham

Well it's invariant in sci.energy. Since Bill Clinton moderates the norron group, and sci.chem funds it with kickbacks to the Neo Commie coommittee for the promotion of reverse osmosis and sychronicity..

Lead Acid batteries are always the wrong choice unless you enjoy being in permanent debt to the government.

Since the primary attraction of wind energy is that it can reduce the cost of power meters to zero,

. Is there a similar effect to sulfation

Fine. You're an insane k00k.

No problem.

Graham

And you're a Buckeyball wannabee moron who should really post to alt,sci.clinton rather than a newsgroup.

You're a clueless insane k00k.

Graham